Better scroll tracking, better mobile layouts

We've taken the time to update two highly requested features.

• Mobile layout - On mobile the layout will now use a min height feature to help content flow better.
• Scroll Tracking - Now when you move the page using the scrollbar, Alton will update and keep track of where in the page you are.

We are working on more things including linking inside Alton to slides, and better keyboard support. So keep your eyes peeled for that.